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Surname Banasiak (Banasiak ) , across the world, is quite a common cognomen. The family name Banasiak is characteristic of Jersey, where it is quite a common surname, Poland, and Ireland, where it is a rare surname. Not in comparison with a country's population, the name is most common in Poland, the United States, and Germany. More frequently, Banasiak is the forename as well as the last name.